Background

Adventure Guide

The ancient inhabitants of Pandaria recognized the vital importance of the lifegiving Pools of Power, building an underground system of aqueducts to safeguard the waters and nurture life in the Vale of Eternal Blossoms. The touch of corruption has animated and twisted these waters, and Immerseus stands as an unnatural embodiment of the Vale's sorrow.

Encounter Design

The layout of this area and the visual framing of the boss as players enter the raid zone hearkens back to Lord Marrowgar at the entrance to Icecrown Citadel—we wanted to make sure that the first thing players saw when they entered the Raid was a huge and visually impressive foe. Long-time players (or pet collectors) may find the fight structure somewhat reminiscent of Viscidus in the Temple of Ahn’Qiraj.[2]

Overview

Immerseus begins with 100 Corruption, displayed as a visible power bar, and the objective of the encounter is to cleanse him by reducing his Corruption level to 0. Each time Immerseus is reduced to zero health, he will Split into a mix of dark Sha Puddles and watery Contaminated Puddles. As the Puddles move back towards the center of the chamber, damage-dealers must destroy Sha Puddles, while healers try to heal Contaminated Puddles in order to fully purify them, before they reach the central pool. Following each Split, Immerseus will reform with reduced health and Corruption depending on how successful the raid was in dealing with the two types of Puddles. This cycle will repeat until Immerseus is cleansed.

Damage Dealers

Rotate away from Immerseus's Swirl ability.

When Immerseus splits, destroy the dark Sha Puddles before they reach the center and merge into Immerseus.

Healers

Rotate away from Immerseus's Swirl ability.

When Immerseus splits, heal Contaminated Puddles to purify them before they reach the center and merge with Immerseus.

When Sha or Contaminated Puddles reach the central pool, each one triggers Erupting Sha, damaging the entire raid.

Tanks

Point Immerseus away from the raid, and take turns tanking to mitigate the effects of Corrosive Blast.

When Immerseus splits, destroy the dark Sha Puddles before they reach the center and merge into Immerseus.

Swirl — Immerseus causes torrents of Sha-corrupted water to burst from beneath the cracks in the ground. Players that come into contact with the tainted waters will suffer 30,000 Shadow damage and be knocked away.

Swelling Corruption — Immerseus surges with power, gaining stacks of Swelling Corruption proportional to his current Corruption level. This power lashes out at players who strike Immerseus with single target abilities, coalescing into a Congealed Sha creature as well as inflicting Sha Corruption upon the attacker, which deals at least 2500 Shadow damage every 1 sec for 6 sec, increasing in damage rapidly with each additional stack.

Split

Upon reaching zero health, Immerseus becomes unstable and bursts into a shower of Sha Puddles and Contaminated Puddles, which will attempt to reform in the pool at the center of the chamber.
For each Sha puddle killed and each Contaminated Puddle healed to full, Immerseus's Corruption is reduces by one. When Immerseus reaches zero Corruption, he is cleansed of the Sha taint and becomes friendly.

Sha Puddle — When destabilized, Immerseus forms one Sha Puddle for every four units of Corruption he has. Destroying a Sha Puddle before it merges back into the central pool will remove one unit of Corruption.

Sha Residue — When a Sha Puddle is destroyed, it triggers Sha Residue, inflicting 75,000 Shadow damage to enemies within 8 yards and increasing damage dealt to other Sha Puddles by 25%. Stacks.

Contaminated Puddle — When destabilized, Immerseus forms one Contaminated Puddle for every four units of Corruption that have previously been removed. Healing a Contaminated Puddle to full health before it merges back into the central pool will cause it to become Purified, and remove one unit of Corruption upon reaching Immerseus.

Congealing — The speed of the Contaminated Puddle wanes as it increases in health.

Purified Residue — Upon reached full health, a Contaminated Puddle released Purified Residue, restoring 25% mana to all allies within 10 yards and increasing healing done by 75%. Stacks.

Erupting Sha — When any Puddle reaches Immerseus, it triggers Erupting Sha, which inflicts 75,000 Shadow damage to all players.

Sha Pool — The Sha Pool grows over time, inflicting at least 3,000 Shadow damage over 1 sec to enemies who touch it, stacking and increasing rapidly in damage proportional to the number of stacks. Touching the Sha Pool causes it to shrink, whereas it will expand whenever any Puddle reaches it.

Strategy

Immerseus alternates between two phases: the "normal" phase and the "corruption" phase. The objective of the raid is to empty his corruption bar, which can only happen in the corruption phase; the raid must DPS Immerseus to zero HP in the normal phase to trigger the phase transition.

Immerseus' enrage timer has been estimated at around 10 minutes [3], which should not be an issue for most groups, especially on normal mode.

Normal Phase

Tanks need to face Immerseus away from the raid (and away from each other) due to Corrosive Blast, and will need to regularly taunt off each other to avoid being one-shotted by this ability.

The rest of the raid will be periodically targeted by Sha Bolts. These leave a void zone and, with all void zones, players need to move out of them. The void zones persist until the phase transition, so players must carefully position the pools in such a way that they don't position themselves into a corner with no means of escape.

When Immerseus casts Swirl, the raid must simply rotate ahead of the beam. This ability is reminiscent of Durumu's Disintegration Beam and Wise Mari's Wash Away.

Players should take care not to enter Immerseus' circular puddle, as it cases both damage and a knockback.

Corruption Phase

Once Immerseus is brought down to zero HP in the normal phase, blobs of corruption will fly out of him. There are two types of blobs, Sha Puddles and Contaminated Puddles.

DPS (with tanks contributing) will need to head after the Sha Puddles and burst them down one at a time. For each Sha Puddle killed, players within 10 yards will receive a stacking buff increasing damage to other Sha Puddles by 25%, and Immerseus' corruption bar will permanently decrease by 1.

Healers will need to heal the Contaminated Puddles one at a time. The puddles slow down the more they are healed, and when healed to full, healers within 10 yards will receive 25% mana as well as 75% increased healing for 10 seconds. Healing a Contaminated Puddle to full health also permanently decreases the corruption bar by 1.

Any puddles that reach the boss will deal raid wide damage, so the raid needs to kill/heal as many puddles as possible before the remaining puddles reach the boss, and use raid cooldowns to survive the damage when they do. Immerseus will then re-form with reduced health (corresponding to his corruption bar), and the raid will head back into the normal phase.

The fight will then alternate between the two phases until the raid kills/heals enough blobs to empty the boss's corruption bar. When this happens, Immerseus becomes friendly, and the fight is over.

Achievement: No More Tears

To earn [No More Tears], the raid will need to attempt to stop Sha Puddles from ever reaching the boss during the Corruption Phase. The puddles are immune to [Ring of Frost], [Banish], [Fear] and other forms of crowd control, but can be stunned, slowed, rooted and knocked back.

After 30 seconds, Immerseus will return to the Normal Phase, and any Sha Puddles that have not reached the boss at this time will transform into Tears of the Vale. They have little health and do not need to be tanked, but cast a raid-wide AoE that can quickly overwhelm healers (even in Flexible Difficulty), so the raid will need to nuke them down as quickly as possible. Once 10 such Tears of the Vale has been killed, the raid can then proceed to defeating the encounter normally.

Attempting the achievement will however bring the encounter's usually generous hard enrage timer into play; too many prolonged Corruption Phases can end in a wipe due to the enrage timer. The raid should aim for 3-4 Tears of the Vale per Corruption Phase until enough have been killed, or even 5 if the healers are confident.

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